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Organization and Basis of Presentation - Summary of Financial Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Equity securities: |  |  |
Gross Unrealized Gain (Loss) | $ (24,585) | $ 6,276 |
Carrying Value | 800 |  | $ 800
Available for sale |  |  |
Equity and Debt Securities, Amortized Cost | 144,458 |  | 142,398
Equity and Debt Securities, Gross Unrealized Gain (Loss) | 25,244 |  | 49,431
Equity and Debt Securities, Marketable Securities | 169,702 |  | 191,829
Investment funds - debt securities |  |  |
Equity securities: |  |  |
Cost | 62,382 |  | 62,192
Gross Unrealized Gain (Loss) | (4,638) |  | (502)
Carrying Value | 57,744 |  | 61,690
Common stock and stock funds |  |  |
Equity securities: |  |  |
Cost | 81,026 |  | 79,155
Gross Unrealized Gain (Loss) | 29,143 |  | 49,592
Carrying Value | 110,169 |  | 128,747
Investment-grade unsecured debt |  |  |
Available for sale |  |  |
Cost | 1,050 |  | 1,051
Gross Unrealized Gain (Loss) | 739 |  | 341
Carrying Value | $ 1,789 |  | $ 1,392

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